From SwingPoynt's video "A Nightmare Ready Build for *EVERY* Cleaner (8 Total) 🩸 Back 4 Blood Builds and Best Deck Guide"
No specific primary weapon from the video. I would suggest something that is good without cards and focused on commons since your explosives handle tallboys and such. Assault rifles or SMGs propably.
Hyper-focused can be swapped for Glass cannon for more explosive damage.
Superior cardio can be swapped for Grenade pouch.